angular-translate

angular.module('app.core', ['pascalprecht.translate']).config(['$translateProvider', '$translatePartialLoaderProvider',
    function($translateProvider, $translatePartialLoaderProvider) {
        $translatePartialLoaderProvider.addPart('common');
        $translatePartialLoaderProvider.addPart('state');
        $translatePartialLoaderProvider.addPart('reset');
        $translateProvider.useLoader('$translatePartialLoader', {
            urlTemplate: 'build/i18n/{lang}/{part}.i18n'
        });
        $translateProvider.preferredLanguage('cn');
    }
])

toastr.success($translate.instant('feedback_cert_delete_result'))

Using partialLoader

12_asynchronous-loading

$translatePartialLoaderProvider

$ bower install angular-translate-loader-partial

angular.module('app.cert', [])
.config(['$translatePartialLoaderProvider', function($translatePartialLoaderProvider) {
    $translatePartialLoaderProvider.addPart('cert');
}])